"echelle" meaning in English

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      "expansion": "French échelle (“ladder”)",
      "name": "bor"
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  "etymology_text": "From French échelle (“ladder”). Doublet of scale.",
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    {
      "form": "echelles",
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        "plural"
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      "derived": [
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          "word": "echellette"
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      "glosses": [
        "An echelle grating."
      ],
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        "(physics) An echelle grating."
      ],
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  "word": "echelle"
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    {
      "word": "echellette"
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  "etymology_text": "From French échelle (“ladder”). Doublet of scale.",
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  "word": "echelle"
}